I think there is an arguement here.
Although through sheer numbers of players, there are
more 'fish' at 50NL.
The Fish are definitely
fishier at 100NL than the fish at 50NL in my opinion.
Why?
Your casual player who does not know nor care about
bankroll management throws on say $100-$200 with a deposit.
They then just sit at the first $100NL or even $200NL table they find until they make a few buyins or lose it.
The people who deposit and sit down at 1 table with their whole deposit tend to deposit more than $50 I would imagine.
And obviously this depends on the site time of day etc. and since this is only opinion, is probably dead wrong.
But it makes sense if you think about it for a minute.